post sorting in slide

I have code:

<?php<br />
$slidecatID = get_cat_id(get_option('scar_gldcat'));<br />
$slidecount = get_option('scar_gldct');</p>
<p>$my_query = new WP_Query('cat=5'. $slidecatID . '&showposts=6' . $slidecount . '$orderby=ran');<br />
while ($my_query->have_posts()) : $my_query->the_post();$do_not_duplicate = $post->ID;<br />
?>

I want to sort post that will be showing from category ID=5
I use to do that this ==> ‘cat=5’
There will be 6 post,
I use to do that this ==> ‘&showposts=6’
everything to this point is working

But I want show only recent post, not random.
want to change this one ==> ‘$orderby=ran’
I want sort the post by date, that the last
6 post from category id 5 will be visible on each
page where the slide is included.
Anyone know how to do it ?? Really need a help . . .